Meanwhile, at my kids' elementary school, they gave my 7-year-old's class squirt guns and water balloons and let them have a water fight for the last day of school. They had a huge kiddie pool full of water for them to refill at and buckets of water balloons we room-parents spent the morning filling. The best part was when the fire department next door came over and used the hoses to shoot water into the air for the kids to run under.